Concrete joist form and the like



Nov. 21, 1939. 5 ROGOW 2,180,964

CONCRETE JOIST FORM AND rm: LIKE 2 Sheets-Sheet 1 Filed March 2. 193'? INVENTOR. Sydney 209010 I ATTORNEY 5 Nov. 21, 1939.

s. ROGOW CONCRETE JOIST FORM AND THE LIKE Filed March 2, 19s? 2 Sheets-sheaf 2 ATTORNEYS.

Patented Nov. 21, 1939 UNITED s'rarss eraser parser orrice CONCRETE JOIST FORM AND THE LIKE Sydney Rogow, Forest Hills, N. Y.

Application March 2, 1937, Serial No. 128,567

12 Claims. (Cl. 25-1315) I This invention relates to improvements in forms for concrete joist constructions.

In usual constructions using removable metal forms or pans and end caps, the spreader for the end cap is of wood and it is necessary to back-up the end caps from below after we'dging the spreader into position. This is an expensive addition to the erection cost, as the work must all 'be done on scaffolds and by carpenters. By the use of my novel end cap spreader this labor cost is entirely eliminated. Also in use the wood spreaders become damaged and must be replaced from time to time. My metal spreader does not warp or break and can be used indefinitely.

Where tapered end pans are used, it is necessary to use a fishtail to form the flared end of the joist sofiit at that point. The wood fishtails heretofore used do not last throughout an entire 20 job and must be replaced. The wood fishtails are easily broken in stripping. In making the fishtails out of metal several advantages result. An important advantage is the saving of materials obtained by using a metal fishtail. The .5 metal fishtail eliminates the necessity of cutting the lumber to exact size, and further eliminates the necessity of cutting the sofiit boards to an exact length to fit in between the fishtails.

hereinafter pointed out.

In the drawings: I

Fig. 1 represents a longitudinal section of a floor slab with the pans in position and with the concrete poured and showing tapered end pans and a metal spreader for the end cap at one end and a square end pan and metal spreader for the same at the other end.

Fig. 2 represents a top plan view of the construction shown in Fig. 1;

40 Fig. 3 represents a vertical transverse cross section taken substantially on line 3-3 of Fig, 1, showing the spreader in position;

Fig. 4 represents an enlarged vertical transverse section taken substantially on line 4-4 of Fig, l;

-Fi.g. 5 represents a longitudinal cross section taken substantially on line 55 of Fig. 4;

Fig. 6 represents an enlarged top plan view of 50 a tapered end pan;

Fig. 7 represents an end elevation of the end pan shown in Fig. 6 looking from the large end toward the small end;

Fig. 3 represents a top plan view of the end 55 cap for use with the end pan;

with an end cap 20 or 2B. prises twoparts (see Figs. 8 and 9) having hori- Further advantages of my invention will be Fig. 9- represents a side elevation of the end cap shown in separated condition;

Fig. 10 represents a top plan view of a metal fish plate;

Fig. 11 represents an end elevation of fish 5 plate;

Fig. 12 represents a top plan view of a metal end cap spreader; and

Fig. 13 represents a perspective view of the spreader shown inv Fig, 12. I

Referring now to the drawings, the reference character ill generally'designates the under framing forsupporting the various members of the mold construction. The joist planks l2 are supported. by members l3 and have bearing strips 15 I 3 upon which the metal end spreaders l6 and it and intermediate spreaders G8 are mounted. The p ans have flanges which rest on the metal Spreaders l6 and i6 and intermediate wood spreaders it. Each end pan I!) or E9 is provided The end cap 20 comzontal flanges 22 cut away-as at'M to permit relative movements of the parts for adjustment purposes. The parts of the end cap also have 25 vertical flanges 26. The end cap flanges Z2 and it are provided with openings 2% to receive bolts till -passing through openings 32 in the end pan l9 "corresponding in position to openings 28 in the flanges of the end caps. In Figs. 6. 8 and 9, 30 I have shown the end cap for the small end of a tapered end pan but it will be understood that the end caps 26 are used for the square-end pans l9 which are not tapered. Seethe right hand end of Fig. i. j Before placingthe end pan and end cap in position, it is necessary to locate my metal spreader lain correct position on the bearing strips M; This spreader includes a base member 31 formed as a channel'38 having hooks All 40 pivoted to the underside of the channel at 42. The channel reinforces the base member. The hooks have sharp points 44 so that the hooks may be driven into the bearing strips M as at 45 or I other part of the frame. The hooks may be bent 45 to be attached to any adjacent part of the frame. In this way the spreader is firmly fastened without the use of nails. The spreader l6 has a vertical flange 46 extending upwardly frorn one side of the channel 38, the flange being spaced from 50 the ends of the channel to provide shoulders 48 upon which the lower flanged edges 5!! of the end pans l9 rest and are supported. The flange 15 at its upper end has an inwardly bent portion 52. to assist in guiding the end cap of the I end pan during assembly. The bent portion 52 has bevelled ends 53 which assist in assembly of the parts. The metal spreader I 6 or IE is placed on bearing strips 14 so that vertical flange 45 is vertically in line with the edge of strip 54, leaving enough clearance for the thickness of end cap 20. Strip 54 is supported on joist planks l2 running transversely thereof and forms the sofiit of the concrete T-beam or shoulder lying in substantially the same plane as the soflit board later to be described. In the case of spreader l6, flange 45 is in line with the edge of bridging joist soifit 54, and the hooks 40 are driven into strips [4 as shown in Fig. 3 so that the spread-er is securely held in correct position. The end pan with its end caps bolted to it by bolts 30 isthen positioned over flange 52 and then forced downwardly. The flanges 52 and 46 assist in guiding the end pan as it is wedged between the end spreader l6 and strip 54. The end cap is firmly held in place so that it cannot move when the concrete is poured. The end pan is supported on the shoulders 48 of the spreader. The flange 46 is of about the same length as the width of the end pan to support the sides of the pan and prevent collapsing or buckling of the sides thereof during pouring of the concrete. Also the flange 46 prevents inward buckling or collapsing of the end cap during pouring of the concrete. From the above it will be seen that the spreader provides a reinforcement for the end of the pan and helps to form a tight joint between the parts. The ordinary spreaders l8 may be used at the joints 6! between the pans. As in usual prac tice the pans are in overlapping relation at their ends as at 62.

With the pans assembled as above set forth and with solfit boards 63 in place on joist planks l2, concrete may be poured. After the concrete is hard, the metal spreaders may be removed by releasing the hooks 40 and they can be used for another operation. The other spreaders [8 are also removed so that the pans can be removed and used on another floor or another job.

Where tapered end pans are used, I provide a tapered metal flshtail as shown in Figs, 10 and 11, for example, in order to form the flared end of the joist soiflt at that point. The flshtail is wedged between adjacent end pans. This fishtail member is made with tapering sides 54 having flanges 55. At its wide end the flshtail has a part of the flanges 66 cut away as at 58 to provide a supporting extension 10. In use the flshtail is applied to the construction after the metal forms have been positioned as above set forth but of course before the concrete is poured. The fishtail is placed between the tapered end pans and is forced or wedged therebetween so that extension 10 of the flshtail rests on and is supported by strips 54 mounted on the ends of joist planks l2, and running at right angles thereto. (See Figs. 1 and 2). The rest of the flshtail is supported by soflit boards 63. It will be noted that soflit boards 53 do not extend for the entire length of the flshtail but extend only for a portion of the length. While the soflit boards may extend for the entire length of the flshtail, it is not necessary where my metal fishtail is used. This is one of the advantages of using my metal flshtail. Where wood fishtails are used, it is necessary to cut the soflit boards to an exact length to fit in between the fishtails. Any slight change in span length means that a standard length soffit board has to be cut down or spliced out which increases the cost of installation. If wood fishtails are used, a large percentage of them has to be replaced on each successive floor because the wood fishtails are easily broken in stripping. With the use of metal flshtails, the standard width soflit boards can run through at random length anywhere to within six to twelve inches or so of the end of the joist. The metal flshtail gives better results because it does not warp and is supported at its wide end on strip 54 by means supporting end 10 so that the flshtail cannot turn or deflect when the concrete is poured. The flanges 66 also reinforce the flshtail to give a stronger construction.

The fishtail may be provided with openings 16 for inserting the nails or hangers which are to remain in the concrete after the metal forms are removed, as for lathing or the like.

With the metal pans and fishtails in position as above set forth, the concrete is poured and after the concrete is hard, the metal pans and fishtails can be removed and used immediately for other construction work, if desired.

I claim:

1. A construction of the character described including, in combination, joist planks and sofiit boards, a plurality of spaced tapering end metal pans supported by said joist planks, end caps in said end pans, a spreader in each end pan for reinforcing the end pan and end cap in each pan, and metal flshtail members wedged between said end metal pans and resting on said soflit boards, said spreader including a base member, and an upper portion extending from said base member and so formed with respect to said base member as to leave support on the latter for said pan, and said soflit boards extending only for parts of the lengths of said flshtail members.

2. A construction of the character described including, in combination, underframing, a member supported by said underframing, joist planks and soffit boards supported by said underframing, a soffit strip supported by said joist planks and extending transversely thereof, a plurality of spaced tapered end metal pans supported by said joist planks, end caps in said end pans for closing the ends of said pans, a spreader in each end pan for reinforcing the end pan and end cap in each pan and for forming a sealed joint between the parts, and metal flshtail members tapered to fit between said tapered end pans, said flshtail members being wedged between said tapered end pans, said fishtail members having portions resting on said soflit boards and other portions resting on said sofiit strip,

3. A construction of the character described, including, in combination, joist planks and soflit boards, a plurality of spaced tapered end metal pans supported by said joist planks, end caps in said end pans, a spreader in each end pan for reinforcing the end pan and end cap in each pan, and tapered metal flshtail members wedged between said end metal pans and resting on said soffit boards, each of said spreaders including a base member and an upper portion extending from said base member and having an inclined surface facing said end caps, said upper portion being so formed with respect to said base member as to leave supports on the latter for said pans, and said soffit boards extending only parts of the lengths of said flshtail members.

4. A construction of the character described including, in combination, a supporting member, joist planks, sofiit boards and sofiit strips thereon, tapered end pans supported by said joist planks, and tapered fishtail members each having a supporting extension at one end and flanged sides, each of said fishtail members being supported near one end by said soflit boards and at the other end by said supporting extension resting on said sofiit strips, said fishtail members being wedged between said tapered end pans.

5. A spreader of the character described including a base member and an upper portion extending from said base member, said upper portion having an inclined surface and said upper portion being so formed with respect to said base member as to leave supports in said base member for a pan with which said spreader is adapted to be used.

6. A metal spreader adapted for use with pans for concrete joist constructions, including a base member, a flange extending from said base memher, said flange having a bent top portion, said top portion having beveled ends, and hooks pivotally mounted on the end portions of said base member, said flange being so formed with'respect to said base member as to leave supports on said base member for a pan with which said spreader is adapted to be used.

7. A metal spreader of the character described, including a channeled base member, a flange extending upwardly from one side of the base member, said flange having an inwardly bent top portion, and hooks pivotally mounted on the endportions of said base member, said flange being.

so formed with respect to said base member as to leave supports on the latter for a pan with which said spreader is adapted to be used.

8. A metal spreader adapted for use with pans for concrete joist constructions, including a channeled base member, a flange extending from one side of said channeled base member and positioned inwardly of the ends of said base member so as to provide shoulders for supporting a metal pan in assembly, and means on said base member and adapted to securely hold the spreader in position in a part of the wood framing of the concrete mold.

9. A construction of the character described including in combination joist planks, spreaders between. said joist planks and supported thereby, pans supported by said spreaders and end caps in said pans, said spreaders including a base,

10. A construction according to claim 9 where in the upper portion of said spreaders has an inclined surface facing said end caps.

11. A construction ofthe character describedv including in combintion underframing, joist planks and sofiit boards supported by said underframing, asofi'it strip extending transversely of said joist planks, spaced end pans supported by said joist planks and having the outermost ends of the pansspaced from each other further than the inner ends thereof and tapered metal fishtail members between said end pans and supported by said soflit strip adjacent the wider end thereof and supported near the other end thereof by said sofiit boards, said soffit boards terminating short of the sofiit strip.

12. A construction of the character described including in combination underframing, joist planks and soifit boards supported by said underframing, spaced end pans supported by said joist planks and having the outermost ends of the pans spaced from each other further than the inner ends thereof, and tapered metal fishtail members between said end pans and supported adjacent the narrower end thereof by said soffit boards and supported adjacent the other end by support means substantially wider than the width of said soifit boards to prevent tilting of said fishtail members, 

